(What is a residual? See "Residuals and Leastern Squares".) The graphing calculator provides a least squares regression equation to recognize regression models. When regression models are computed, residuals are instantly stored in a list referred to as RESID. If you desire to view the RESID list, in the column list area of the calculator, you can place the values in L3 (for example). Go toSTAT and pick EDIT. Place the cursor on the heading forL3. Press LIST (2nd STAT) and also choose #7 RESID. PressENTER. The residual worths are currently in L3 for easy viewing.
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Consider this set of information (which is “almost” a perfect direct equation)
If the data had actually been a perfect linear equation, you would have:
After adjusting the home window, just hit GRAPH (not Zoom).
Step-by-action Instructions for Producing a Residual Plot:1. Store your data in lists. Enter the x-worths in L1 and the y-worths in L2.
STAT, arrow ideal to CALC, select either 4:LinReg(ax+b) or 8:LinReg(a+bx)
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